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nl/cfg80211: force scan using an AP vif if requested
[linux-2.6-block.git] / net / mac80211 / tx.c
CommitLineData
e2ebc74d
JB		 1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 *
12 * Transmit and frame generation functions.
13 */
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/skbuff.h>
18#include <linux/etherdevice.h>
19#include <linux/bitmap.h>
d4e46a3d 20#include <linux/rcupdate.h>
bc3b2d7f 21#include <linux/export.h>
881d966b 22#include <net/net_namespace.h>
e2ebc74d
JB		 23#include <net/ieee80211_radiotap.h>
24#include <net/cfg80211.h>
25#include <net/mac80211.h>
26#include <asm/unaligned.h>
27
28#include "ieee80211_i.h"
24487981 29#include "driver-ops.h"
2c8dccc7 30#include "led.h"
33b64eb2 31#include "mesh.h"
e2ebc74d
JB		 32#include "wep.h"
33#include "wpa.h"
34#include "wme.h"
2c8dccc7 35#include "rate.h"
e2ebc74d 36
e2ebc74d
JB		 37/* misc utils */
38
252b86c4
JB		 39static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
03f93c3d 41 int next_frag_len)
e2ebc74d
JB		 42{
43 int rate, mrate, erp, dur, i;
2e92e6f2 44 struct ieee80211_rate *txrate;
e2ebc74d 45 struct ieee80211_local *local = tx->local;
8318d78a 46 struct ieee80211_supported_band *sband;
358c8d9d 47 struct ieee80211_hdr *hdr;
252b86c4 48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e6a9854b
JB		 49
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
52 return 0;
53
54 /* uh huh? */
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
56 return 0;
e2ebc74d 57
2d56577b 58 sband = local->hw.wiphy->bands[info->band];
e6a9854b 59 txrate = &sband->bitrates[info->control.rates[0].idx];
8318d78a 60
e6a9854b 61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
e2ebc74d
JB		 62
63 /*
64 * data and mgmt (except PS Poll):
65 * - during CFP: 32768
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 *
73 * IEEE 802.11, 9.6:
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
78 * BSSBasicRateSet
79 */
252b86c4 80 hdr = (struct ieee80211_hdr *)skb->data;
358c8d9d 81 if (ieee80211_is_ctl(hdr->frame_control)) {
e2ebc74d 82 /* TODO: These control frames are not currently sent by
ccd7b362 83 * mac80211, but should they be implemented, this function
e2ebc74d
JB		 84 * needs to be updated to support duration field calculation.
85 *
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
93 * and its SIFS
94 * PS Poll: BIT(15) | BIT(14) | aid
95 */
96 return 0;
97 }
98
99 /* data/mgmt */
100 if (0 /* FIX: data/mgmt during CFP */)
03f93c3d 101 return cpu_to_le16(32768);
e2ebc74d
JB		 102
103 if (group_addr) /* Group address as the destination - no ACK */
104 return 0;
105
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 */
116 rate = -1;
8318d78a
JB		 117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
e2ebc74d 121
8318d78a
JB		 122 if (r->bitrate > txrate->bitrate)
123 break;
e2ebc74d 124
bda3933a 125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
8318d78a
JB		 126 rate = r->bitrate;
127
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
130 u32 flag;
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
133 else
134 flag = IEEE80211_RATE_MANDATORY_B;
135 if (r->flags & flag)
136 mrate = r->bitrate;
137 break;
138 }
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
141 mrate = r->bitrate;
142 break;
3a0c52a6
VK		 143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
8318d78a
JB		 145 case IEEE80211_NUM_BANDS:
146 WARN_ON(1);
147 break;
148 }
e2ebc74d
JB		 149 }
150 if (rate == -1) {
151 /* No matching basic rate found; use highest suitable mandatory
152 * PHY rate */
153 rate = mrate;
154 }
155
6674f210
SW		 156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
c26a0e10 158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
6674f210
SW		 159 dur = 0;
160 else
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
4ee73f33 164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
bda3933a 165 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 166
167 if (next_frag_len) {
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
171 /* next fragment */
4ee73f33 172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
8318d78a 173 txrate->bitrate, erp,
bda3933a 174 tx->sdata->vif.bss_conf.use_short_preamble);
e2ebc74d
JB		 175 }
176
03f93c3d 177 return cpu_to_le16(dur);
e2ebc74d
JB		 178}
179
e2ebc74d 180/* tx handlers */
5c1b98a5
KV		 181static ieee80211_tx_result debug_noinline
182ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
183{
184 struct ieee80211_local *local = tx->local;
0c74211d 185 struct ieee80211_if_managed *ifmgd;
5c1b98a5
KV		 186
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
189 return TX_CONTINUE;
190
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
193 return TX_CONTINUE;
194
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
197 return TX_CONTINUE;
198
199 /* we are scanning, don't enable power save */
200 if (local->scanning)
201 return TX_CONTINUE;
202
203 if (!local->ps_sdata)
204 return TX_CONTINUE;
205
206 /* No point if we're going to suspend */
207 if (local->quiescing)
208 return TX_CONTINUE;
209
0c74211d
KV		 210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
212 return TX_CONTINUE;
213
214 ifmgd = &tx->sdata->u.mgd;
215
216 /*
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
223 * peer application.
224 *
dc41e4d4 225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
0c74211d
KV		 226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
228 */
4875d30d
JB		 229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
0c74211d
KV		 232 return TX_CONTINUE;
233
5c1b98a5
KV		 234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_QUEUE_STOP_REASON_PS);
db28569a 237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
5c1b98a5
KV		 238 ieee80211_queue_work(&local->hw,
239 &local->dynamic_ps_disable_work);
240 }
241
5db1c07c
LC		 242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd->associated)
244 return TX_CONTINUE;
245
5c1b98a5
KV		 246 mod_timer(&local->dynamic_ps_timer, jiffies +
247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
248
249 return TX_CONTINUE;
250}
e2ebc74d 251
d9e8a70f 252static ieee80211_tx_result debug_noinline
5cf121c3 253ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
e2ebc74d 254{
358c8d9d 255
e039fa4a 256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
c2c98fde 258 bool assoc = false;
e2ebc74d 259
e039fa4a 260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
9ae54c84 261 return TX_CONTINUE;
58d4185e 262
b23b025f
BG		 263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
a9a6ffff
KV		 265 !ieee80211_is_probe_req(hdr->frame_control) &&
266 !ieee80211_is_nullfunc(hdr->frame_control))
267 /*
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
275 *
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
277 */
9ae54c84 278 return TX_DROP;
e2ebc74d 279
1be7fe8d
BJ		 280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
281 return TX_CONTINUE;
282
05c914fe 283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
33b64eb2
LCC		 284 return TX_CONTINUE;
285
5cf121c3 286 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
9ae54c84 287 return TX_CONTINUE;
e2ebc74d 288
c2c98fde
JB		 289 if (tx->sta)
290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
e2ebc74d 291
5cf121c3 292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
c2c98fde 293 if (unlikely(!assoc &&
358c8d9d 294 ieee80211_is_data(hdr->frame_control))) {
e2ebc74d 295#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0
JB		 296 sdata_info(tx->sdata,
297 "dropped data frame to not associated station %pM\n",
298 hdr->addr1);
299#endif
e2ebc74d 300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
9ae54c84 301 return TX_DROP;
e2ebc74d 302 }
29623892
JB		 303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
304 ieee80211_is_data(hdr->frame_control) &&
030ef8f8 305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
29623892
JB		 306 /*
307 * No associated STAs - no need to send multicast
308 * frames.
309 */
310 return TX_DROP;
e2ebc74d
JB		 311 }
312
9ae54c84 313 return TX_CONTINUE;
e2ebc74d
JB		 314}
315
e2ebc74d
JB		 316/* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320static void purge_old_ps_buffers(struct ieee80211_local *local)
321{
322 int total = 0, purged = 0;
323 struct sk_buff *skb;
324 struct ieee80211_sub_if_data *sdata;
325 struct sta_info *sta;
326
79010420 327 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
e2ebc74d 328 struct ieee80211_if_ap *ap;
05c914fe 329 if (sdata->vif.type != NL80211_IFTYPE_AP)
e2ebc74d
JB		 330 continue;
331 ap = &sdata->u.ap;
332 skb = skb_dequeue(&ap->ps_bc_buf);
333 if (skb) {
334 purged++;
335 dev_kfree_skb(skb);
336 }
337 total += skb_queue_len(&ap->ps_bc_buf);
338 }
e2ebc74d 339
948d887d
JB		 340 /*
341 * Drop one frame from each station from the lowest-priority
342 * AC that has frames at all.
343 */
d0709a65 344 list_for_each_entry_rcu(sta, &local->sta_list, list) {
948d887d
JB		 345 int ac;
346
347 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
348 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
349 total += skb_queue_len(&sta->ps_tx_buf[ac]);
350 if (skb) {
351 purged++;
c3e7724b 352 ieee80211_free_txskb(&local->hw, skb);
948d887d
JB		 353 break;
354 }
e2ebc74d 355 }
e2ebc74d 356 }
d0709a65 357
e2ebc74d 358 local->total_ps_buffered = total;
bdcbd8e0 359 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
e2ebc74d
JB		 360}
361
9ae54c84 362static ieee80211_tx_result
5cf121c3 363ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 364{
e039fa4a 365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
e039fa4a 367
7d54d0dd
JB		 368 /*
369 * broadcast/multicast frame
370 *
371 * If any of the associated stations is in power save mode,
372 * the frame is buffered to be sent after DTIM beacon frame.
373 * This is done either by the hardware or us.
374 */
375
3e122be0
JB		 376 /* powersaving STAs only in AP/VLAN mode */
377 if (!tx->sdata->bss)
378 return TX_CONTINUE;
379
380 /* no buffering for ordered frames */
358c8d9d 381 if (ieee80211_has_order(hdr->frame_control))
9ae54c84 382 return TX_CONTINUE;
7d54d0dd
JB		 383
384 /* no stations in PS mode */
385 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
9ae54c84 386 return TX_CONTINUE;
7d54d0dd 387
62b517cb 388 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
3a25a8c8
JB		 389 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
390 info->hw_queue = tx->sdata->vif.cab_queue;
62b1208e 391
62b517cb
JB		 392 /* device releases frame after DTIM beacon */
393 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
62b1208e 394 return TX_CONTINUE;
62b1208e 395
7d54d0dd 396 /* buffered in mac80211 */
62b1208e
JB		 397 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
398 purge_old_ps_buffers(tx->local);
399
400 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
bdcbd8e0
JB		 401 ps_dbg(tx->sdata,
402 "BC TX buffer full - dropping the oldest frame\n");
62b1208e
JB		 403 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
404 } else
405 tx->local->total_ps_buffered++;
e2ebc74d 406
62b1208e 407 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
7d54d0dd 408
62b1208e 409 return TX_QUEUED;
e2ebc74d
JB		 410}
411
fb733336
JM		 412static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
413 struct sk_buff *skb)
414{
415 if (!ieee80211_is_mgmt(fc))
416 return 0;
417
c2c98fde 418 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
fb733336
JM		 419 return 0;
420
421 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
422 skb->data))
423 return 0;
424
425 return 1;
426}
427
9ae54c84 428static ieee80211_tx_result
5cf121c3 429ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d
JB		 430{
431 struct sta_info *sta = tx->sta;
e039fa4a 432 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 433 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
3393a608 434 struct ieee80211_local *local = tx->local;
e2ebc74d 435
02f2f1a9 436 if (unlikely(!sta))
9ae54c84 437 return TX_CONTINUE;
e2ebc74d 438
c2c98fde
JB		 439 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
440 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
02f2f1a9 441 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
948d887d
JB		 442 int ac = skb_get_queue_mapping(tx->skb);
443
02f2f1a9
JB		 444 /* only deauth, disassoc and action are bufferable MMPDUs */
445 if (ieee80211_is_mgmt(hdr->frame_control) &&
446 !ieee80211_is_deauth(hdr->frame_control) &&
447 !ieee80211_is_disassoc(hdr->frame_control) &&
448 !ieee80211_is_action(hdr->frame_control)) {
449 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
450 return TX_CONTINUE;
451 }
452
bdcbd8e0
JB		 453 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
454 sta->sta.addr, sta->sta.aid, ac);
e2ebc74d
JB		 455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
456 purge_old_ps_buffers(tx->local);
948d887d
JB		 457 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
458 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
bdcbd8e0
JB		 459 ps_dbg(tx->sdata,
460 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
461 sta->sta.addr, ac);
c3e7724b 462 ieee80211_free_txskb(&local->hw, old);
e2ebc74d
JB		 463 } else
464 tx->local->total_ps_buffered++;
004c872e 465
e039fa4a 466 info->control.jiffies = jiffies;
5061b0c2 467 info->control.vif = &tx->sdata->vif;
8f77f384 468 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
948d887d 469 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
3393a608
JO		 470
471 if (!timer_pending(&local->sta_cleanup))
472 mod_timer(&local->sta_cleanup,
473 round_jiffies(jiffies +
474 STA_INFO_CLEANUP_INTERVAL));
475
c868cb35
JB		 476 /*
477 * We queued up some frames, so the TIM bit might
478 * need to be set, recalculate it.
479 */
480 sta_info_recalc_tim(sta);
481
9ae54c84 482 return TX_QUEUED;
bdcbd8e0
JB		 483 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
484 ps_dbg(tx->sdata,
485 "STA %pM in PS mode, but polling/in SP -> send frame\n",
486 sta->sta.addr);
e2ebc74d 487 }
e2ebc74d 488
9ae54c84 489 return TX_CONTINUE;
e2ebc74d
JB		 490}
491
d9e8a70f 492static ieee80211_tx_result debug_noinline
5cf121c3 493ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
e2ebc74d 494{
5cf121c3 495 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
9ae54c84 496 return TX_CONTINUE;
e2ebc74d 497
5cf121c3 498 if (tx->flags & IEEE80211_TX_UNICAST)
e2ebc74d
JB		 499 return ieee80211_tx_h_unicast_ps_buf(tx);
500 else
501 return ieee80211_tx_h_multicast_ps_buf(tx);
502}
503
a621fa4d
JB		 504static ieee80211_tx_result debug_noinline
505ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
506{
507 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
508
509 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
510 tx->sdata->control_port_no_encrypt))
511 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
512
513 return TX_CONTINUE;
514}
515
d9e8a70f 516static ieee80211_tx_result debug_noinline
5cf121c3 517ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
e2ebc74d 518{
46e6de15 519 struct ieee80211_key *key;
e039fa4a 520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
358c8d9d 521 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
d4e46a3d 522
3b8d81e0 523 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
e2ebc74d 524 tx->key = NULL;
e31b8213 525 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
d4e46a3d 526 tx->key = key;
3cfcf6ac 527 else if (ieee80211_is_mgmt(hdr->frame_control) &&
ecbcd324
JM		 528 is_multicast_ether_addr(hdr->addr1) &&
529 ieee80211_is_robust_mgmt_frame(hdr) &&
3cfcf6ac
JM		 530 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
531 tx->key = key;
f7e0104c
JB		 532 else if (is_multicast_ether_addr(hdr->addr1) &&
533 (key = rcu_dereference(tx->sdata->default_multicast_key)))
534 tx->key = key;
535 else if (!is_multicast_ether_addr(hdr->addr1) &&
536 (key = rcu_dereference(tx->sdata->default_unicast_key)))
d4e46a3d 537 tx->key = key;
46e6de15
JB		 538 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
539 tx->key = NULL;
540 else if (!tx->sdata->drop_unencrypted)
541 tx->key = NULL;
542 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
543 tx->key = NULL;
544 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
545 !(ieee80211_is_action(hdr->frame_control) &&
546 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
547 tx->key = NULL;
4922f71f
NC		 548 else if (ieee80211_is_mgmt(hdr->frame_control) &&
549 !ieee80211_is_robust_mgmt_frame(hdr))
550 tx->key = NULL;
46e6de15 551 else {
e2ebc74d 552 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
9ae54c84 553 return TX_DROP;
46e6de15 554 }
e2ebc74d
JB		 555
556 if (tx->key) {
813d7669
JB		 557 bool skip_hw = false;
558
e2ebc74d 559 tx->key->tx_rx_count++;
011bfcc4 560 /* TODO: add threshold stuff again */
176e4f84 561
97359d12
JB		 562 switch (tx->key->conf.cipher) {
563 case WLAN_CIPHER_SUITE_WEP40:
564 case WLAN_CIPHER_SUITE_WEP104:
97359d12 565 case WLAN_CIPHER_SUITE_TKIP:
358c8d9d 566 if (!ieee80211_is_data_present(hdr->frame_control))
176e4f84
JB		 567 tx->key = NULL;
568 break;
97359d12 569 case WLAN_CIPHER_SUITE_CCMP:
fb733336
JM		 570 if (!ieee80211_is_data_present(hdr->frame_control) &&
571 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
572 tx->skb))
573 tx->key = NULL;
3b43a187
KV		 574 else
575 skip_hw = (tx->key->conf.flags &
e548c49e 576 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
3b43a187 577 ieee80211_is_mgmt(hdr->frame_control);
fb733336 578 break;
97359d12 579 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac
JM		 580 if (!ieee80211_is_mgmt(hdr->frame_control))
581 tx->key = NULL;
582 break;
176e4f84 583 }
813d7669 584
95acac61
JB		 585 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
586 return TX_DROP;
587
f12553eb 588 if (!skip_hw && tx->key &&
382b1655 589 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
813d7669 590 info->control.hw_key = &tx->key->conf;
e2ebc74d
JB		 591 }
592
9ae54c84 593 return TX_CONTINUE;
e2ebc74d
JB		 594}
595
d9e8a70f 596static ieee80211_tx_result debug_noinline
5cf121c3 597ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
e2ebc74d 598{
e039fa4a 599 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
e6a9854b
JB		 600 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
601 struct ieee80211_supported_band *sband;
602 struct ieee80211_rate *rate;
a2c40249
SZ		 603 int i;
604 u32 len;
e6a9854b
JB		 605 bool inval = false, rts = false, short_preamble = false;
606 struct ieee80211_tx_rate_control txrc;
c2c98fde 607 bool assoc = false;
8318d78a 608
e6a9854b 609 memset(&txrc, 0, sizeof(txrc));
e2ebc74d 610
2d56577b 611 sband = tx->local->hw.wiphy->bands[info->band];
58d4185e 612
a2c40249 613 len = min_t(u32, tx->skb->len + FCS_LEN,
b9a5f8ca 614 tx->local->hw.wiphy->frag_threshold);
e6a9854b
JB		 615
616 /* set up the tx rate control struct we give the RC algo */
005e472b 617 txrc.hw = &tx->local->hw;
e6a9854b
JB		 618 txrc.sband = sband;
619 txrc.bss_conf = &tx->sdata->vif.bss_conf;
620 txrc.skb = tx->skb;
621 txrc.reported_rate.idx = -1;
2d56577b 622 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
37eb0b16
JM		 623 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
624 txrc.max_rate_idx = -1;
625 else
626 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
19468413 627 memcpy(txrc.rate_idx_mcs_mask,
2d56577b 628 tx->sdata->rc_rateidx_mcs_mask[info->band],
19468413 629 sizeof(txrc.rate_idx_mcs_mask));
8f0729b1 630 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
4bb62344 631 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
8f0729b1 632 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
e6a9854b
JB		 633
634 /* set up RTS protection if desired */
b9a5f8ca 635 if (len > tx->local->hw.wiphy->rts_threshold) {
e6a9854b 636 txrc.rts = rts = true;
e2ebc74d 637 }
e2ebc74d 638
e6a9854b
JB		 639 /*
640 * Use short preamble if the BSS can handle it, but not for
641 * management frames unless we know the receiver can handle
642 * that -- the management frame might be to a station that
643 * just wants a probe response.
644 */
645 if (tx->sdata->vif.bss_conf.use_short_preamble &&
646 (ieee80211_is_data(hdr->frame_control) ||
c2c98fde 647 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
e6a9854b 648 txrc.short_preamble = short_preamble = true;
e2ebc74d 649
c2c98fde
JB		 650 if (tx->sta)
651 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
b770b43e
LR		 652
653 /*
654 * Lets not bother rate control if we're associated and cannot
655 * talk to the sta. This should not happen.
656 */
c2c98fde 657 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
b770b43e
LR		 658 !rate_usable_index_exists(sband, &tx->sta->sta),
659 "%s: Dropped data frame as no usable bitrate found while "
660 "scanning and associated. Target station: "
661 "%pM on %d GHz band\n",
47846c9b 662 tx->sdata->name, hdr->addr1,
2d56577b 663 info->band ? 5 : 2))
b770b43e 664 return TX_DROP;
2e92e6f2 665
b770b43e
LR		 666 /*
667 * If we're associated with the sta at this point we know we can at
668 * least send the frame at the lowest bit rate.
669 */
e6a9854b
JB		 670 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
671
672 if (unlikely(info->control.rates[0].idx < 0))
673 return TX_DROP;
674
c1ce5a74 675 if (txrc.reported_rate.idx < 0) {
e6a9854b 676 txrc.reported_rate = info->control.rates[0];
c1ce5a74
HS		 677 if (tx->sta && ieee80211_is_data(hdr->frame_control))
678 tx->sta->last_tx_rate = txrc.reported_rate;
679 } else if (tx->sta)
e6a9854b 680 tx->sta->last_tx_rate = txrc.reported_rate;
e039fa4a 681
e6a9854b
JB		 682 if (unlikely(!info->control.rates[0].count))
683 info->control.rates[0].count = 1;
e2ebc74d 684
9955151d
GS		 685 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
686 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
687 info->control.rates[0].count = 1;
688
e6a9854b
JB		 689 if (is_multicast_ether_addr(hdr->addr1)) {
690 /*
691 * XXX: verify the rate is in the basic rateset
692 */
693 return TX_CONTINUE;
e2ebc74d
JB		 694 }
695
e6a9854b
JB		 696 /*
697 * set up the RTS/CTS rate as the fastest basic rate
698 * that is not faster than the data rate
699 *
700 * XXX: Should this check all retry rates?
701 */
702 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
703 s8 baserate = 0;
704
705 rate = &sband->bitrates[info->control.rates[0].idx];
706
707 for (i = 0; i < sband->n_bitrates; i++) {
708 /* must be a basic rate */
709 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
710 continue;
711 /* must not be faster than the data rate */
712 if (sband->bitrates[i].bitrate > rate->bitrate)
713 continue;
714 /* maximum */
715 if (sband->bitrates[baserate].bitrate <
716 sband->bitrates[i].bitrate)
717 baserate = i;
718 }
719
720 info->control.rts_cts_rate_idx = baserate;
7e9ed188
DD		 721 }
722
e6a9854b
JB		 723 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
724 /*
725 * make sure there's no valid rate following
726 * an invalid one, just in case drivers don't
727 * take the API seriously to stop at -1.
728 */
729 if (inval) {
730 info->control.rates[i].idx = -1;
731 continue;
732 }
733 if (info->control.rates[i].idx < 0) {
734 inval = true;
735 continue;
736 }
8318d78a 737
e6a9854b
JB		 738 /*
739 * For now assume MCS is already set up correctly, this
740 * needs to be fixed.
741 */
742 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
743 WARN_ON(info->control.rates[i].idx > 76);
744 continue;
745 }
e2ebc74d 746
e6a9854b
JB		 747 /* set up RTS protection if desired */
748 if (rts)
749 info->control.rates[i].flags |=
750 IEEE80211_TX_RC_USE_RTS_CTS;
8318d78a 751
e6a9854b 752 /* RC is busted */
075cbc9e
S		 753 if (WARN_ON_ONCE(info->control.rates[i].idx >=
754 sband->n_bitrates)) {
e6a9854b
JB		 755 info->control.rates[i].idx = -1;
756 continue;
8318d78a 757 }
e2ebc74d 758
e6a9854b
JB		 759 rate = &sband->bitrates[info->control.rates[i].idx];
760
761 /* set up short preamble */
762 if (short_preamble &&
763 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
764 info->control.rates[i].flags |=
765 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
766
767 /* set up G protection */
768 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
769 rate->flags & IEEE80211_RATE_ERP_G)
770 info->control.rates[i].flags |=
771 IEEE80211_TX_RC_USE_CTS_PROTECT;
e2ebc74d
JB		 772 }
773
e6a9854b
JB		 774 return TX_CONTINUE;
775}
776
f591fa5d
JB		 777static ieee80211_tx_result debug_noinline
778ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
779{
780 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
781 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
782 u16 *seq;
783 u8 *qc;
784 int tid;
785
25d834e1
JB		 786 /*
787 * Packet injection may want to control the sequence
788 * number, if we have no matching interface then we
789 * neither assign one ourselves nor ask the driver to.
790 */
5061b0c2 791 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
25d834e1
JB		 792 return TX_CONTINUE;
793
f591fa5d
JB		 794 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
795 return TX_CONTINUE;
796
797 if (ieee80211_hdrlen(hdr->frame_control) < 24)
798 return TX_CONTINUE;
799
49a59543
JB		 800 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
801 return TX_CONTINUE;
802
94778280
JB		 803 /*
804 * Anything but QoS data that has a sequence number field
805 * (is long enough) gets a sequence number from the global
806 * counter.
807 */
f591fa5d 808 if (!ieee80211_is_data_qos(hdr->frame_control)) {
94778280 809 /* driver should assign sequence number */
f591fa5d 810 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
94778280
JB		 811 /* for pure STA mode without beacons, we can do it */
812 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
813 tx->sdata->sequence_number += 0x10;
f591fa5d
JB		 814 return TX_CONTINUE;
815 }
816
817 /*
818 * This should be true for injected/management frames only, for
819 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
820 * above since they are not QoS-data frames.
821 */
822 if (!tx->sta)
823 return TX_CONTINUE;
824
825 /* include per-STA, per-TID sequence counter */
826
827 qc = ieee80211_get_qos_ctl(hdr);
828 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
829 seq = &tx->sta->tid_seq[tid];
830
831 hdr->seq_ctrl = cpu_to_le16(*seq);
832
833 /* Increase the sequence number. */
834 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
835
836 return TX_CONTINUE;
837}
838
252b86c4 839static int ieee80211_fragment(struct ieee80211_tx_data *tx,
2de8e0d9
JB		 840 struct sk_buff *skb, int hdrlen,
841 int frag_threshold)
842{
252b86c4 843 struct ieee80211_local *local = tx->local;
a1a3fcec 844 struct ieee80211_tx_info *info;
252b86c4 845 struct sk_buff *tmp;
2de8e0d9
JB		 846 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
847 int pos = hdrlen + per_fragm;
848 int rem = skb->len - hdrlen - per_fragm;
849
850 if (WARN_ON(rem < 0))
851 return -EINVAL;
852
252b86c4
JB		 853 /* first fragment was already added to queue by caller */
854
2de8e0d9
JB		 855 while (rem) {
856 int fraglen = per_fragm;
857
858 if (fraglen > rem)
859 fraglen = rem;
860 rem -= fraglen;
861 tmp = dev_alloc_skb(local->tx_headroom +
862 frag_threshold +
863 IEEE80211_ENCRYPT_HEADROOM +
864 IEEE80211_ENCRYPT_TAILROOM);
865 if (!tmp)
866 return -ENOMEM;
252b86c4
JB		 867
868 __skb_queue_tail(&tx->skbs, tmp);
869
2de8e0d9
JB		 870 skb_reserve(tmp, local->tx_headroom +
871 IEEE80211_ENCRYPT_HEADROOM);
872 /* copy control information */
873 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
a1a3fcec
JB		 874
875 info = IEEE80211_SKB_CB(tmp);
876 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
877 IEEE80211_TX_CTL_FIRST_FRAGMENT);
878
879 if (rem)
880 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
881
2de8e0d9
JB		 882 skb_copy_queue_mapping(tmp, skb);
883 tmp->priority = skb->priority;
2de8e0d9 884 tmp->dev = skb->dev;
2de8e0d9
JB		 885
886 /* copy header and data */
887 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
888 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
889
890 pos += fraglen;
891 }
892
252b86c4 893 /* adjust first fragment's length */
2de8e0d9
JB		 894 skb->len = hdrlen + per_fragm;
895 return 0;
896}
897
d9e8a70f 898static ieee80211_tx_result debug_noinline
e2454948
JB		 899ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
900{
2de8e0d9
JB		 901 struct sk_buff *skb = tx->skb;
902 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
903 struct ieee80211_hdr *hdr = (void *)skb->data;
b9a5f8ca 904 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
2de8e0d9
JB		 905 int hdrlen;
906 int fragnum;
e2454948 907
252b86c4
JB		 908 /* no matter what happens, tx->skb moves to tx->skbs */
909 __skb_queue_tail(&tx->skbs, skb);
910 tx->skb = NULL;
911
a26eb27a
JB		 912 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
913 return TX_CONTINUE;
914
915 if (tx->local->ops->set_frag_threshold)
e2454948
JB		 916 return TX_CONTINUE;
917
eefce91a
JB		 918 /*
919 * Warn when submitting a fragmented A-MPDU frame and drop it.
3b8d81e0 920 * This scenario is handled in ieee80211_tx_prepare but extra
8d5e0d58 921 * caution taken here as fragmented ampdu may cause Tx stop.
eefce91a 922 */
8b30b1fe 923 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
eefce91a
JB		 924 return TX_DROP;
925
065e9605 926 hdrlen = ieee80211_hdrlen(hdr->frame_control);
e2454948 927
a26eb27a 928 /* internal error, why isn't DONTFRAG set? */
8ccd8f21 929 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
2de8e0d9 930 return TX_DROP;
e6a9854b 931
2de8e0d9
JB		 932 /*
933 * Now fragment the frame. This will allocate all the fragments and
934 * chain them (using skb as the first fragment) to skb->next.
935 * During transmission, we will remove the successfully transmitted
936 * fragments from this list. When the low-level driver rejects one
937 * of the fragments then we will simply pretend to accept the skb
938 * but store it away as pending.
939 */
252b86c4 940 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
2de8e0d9 941 return TX_DROP;
e6a9854b 942
2de8e0d9
JB		 943 /* update duration/seq/flags of fragments */
944 fragnum = 0;
252b86c4
JB		 945
946 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 947 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
e6a9854b 948
2de8e0d9
JB		 949 hdr = (void *)skb->data;
950 info = IEEE80211_SKB_CB(skb);
e6a9854b 951
252b86c4 952 if (!skb_queue_is_last(&tx->skbs, skb)) {
2de8e0d9 953 hdr->frame_control |= morefrags;
e6a9854b
JB		 954 /*
955 * No multi-rate retries for fragmented frames, that
956 * would completely throw off the NAV at other STAs.
957 */
958 info->control.rates[1].idx = -1;
959 info->control.rates[2].idx = -1;
960 info->control.rates[3].idx = -1;
e3e1a0bc 961 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
e6a9854b 962 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
2de8e0d9
JB		 963 } else {
964 hdr->frame_control &= ~morefrags;
e6a9854b 965 }
2de8e0d9
JB		 966 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
967 fragnum++;
252b86c4 968 }
e2ebc74d 969
9ae54c84 970 return TX_CONTINUE;
e2ebc74d
JB		 971}
972
feff1f2f
JB		 973static ieee80211_tx_result debug_noinline
974ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
975{
252b86c4 976 struct sk_buff *skb;
feff1f2f
JB		 977
978 if (!tx->sta)
979 return TX_CONTINUE;
980
981 tx->sta->tx_packets++;
252b86c4 982 skb_queue_walk(&tx->skbs, skb) {
feff1f2f
JB		 983 tx->sta->tx_fragments++;
984 tx->sta->tx_bytes += skb->len;
252b86c4 985 }
feff1f2f
JB		 986
987 return TX_CONTINUE;
988}
989
d9e8a70f 990static ieee80211_tx_result debug_noinline
e2454948
JB		 991ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
992{
993 if (!tx->key)
994 return TX_CONTINUE;
995
97359d12
JB		 996 switch (tx->key->conf.cipher) {
997 case WLAN_CIPHER_SUITE_WEP40:
998 case WLAN_CIPHER_SUITE_WEP104:
e2454948 999 return ieee80211_crypto_wep_encrypt(tx);
97359d12 1000 case WLAN_CIPHER_SUITE_TKIP:
e2454948 1001 return ieee80211_crypto_tkip_encrypt(tx);
97359d12 1002 case WLAN_CIPHER_SUITE_CCMP:
e2454948 1003 return ieee80211_crypto_ccmp_encrypt(tx);
97359d12 1004 case WLAN_CIPHER_SUITE_AES_CMAC:
3cfcf6ac 1005 return ieee80211_crypto_aes_cmac_encrypt(tx);
3ffc2a90 1006 default:
d32a1028 1007 return ieee80211_crypto_hw_encrypt(tx);
e2454948
JB		 1008 }
1009
e2454948
JB		 1010 return TX_DROP;
1011}
1012
d9e8a70f 1013static ieee80211_tx_result debug_noinline
03f93c3d
JB		 1014ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1015{
252b86c4 1016 struct sk_buff *skb;
2de8e0d9
JB		 1017 struct ieee80211_hdr *hdr;
1018 int next_len;
1019 bool group_addr;
03f93c3d 1020
252b86c4 1021 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9 1022 hdr = (void *) skb->data;
7e0aae47
JM		 1023 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1024 break; /* must not overwrite AID */
252b86c4
JB		 1025 if (!skb_queue_is_last(&tx->skbs, skb)) {
1026 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1027 next_len = next->len;
1028 } else
1029 next_len = 0;
2de8e0d9 1030 group_addr = is_multicast_ether_addr(hdr->addr1);
03f93c3d 1031
2de8e0d9 1032 hdr->duration_id =
252b86c4
JB		 1033 ieee80211_duration(tx, skb, group_addr, next_len);
1034 }
03f93c3d
JB		 1035
1036 return TX_CONTINUE;
1037}
1038
e2ebc74d
JB		 1039/* actual transmit path */
1040
a622ab72
JB		 1041static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1042 struct sk_buff *skb,
1043 struct ieee80211_tx_info *info,
1044 struct tid_ampdu_tx *tid_tx,
1045 int tid)
1046{
1047 bool queued = false;
285fa695 1048 bool reset_agg_timer = false;
aa454580 1049 struct sk_buff *purge_skb = NULL;
a622ab72
JB		 1050
1051 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1052 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1053 reset_agg_timer = true;
0ab33703
JB		 1054 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1055 /*
1056 * nothing -- this aggregation session is being started
1057 * but that might still fail with the driver
1058 */
a622ab72
JB		 1059 } else {
1060 spin_lock(&tx->sta->lock);
1061 /*
1062 * Need to re-check now, because we may get here
1063 *
1064 * 1) in the window during which the setup is actually
1065 * already done, but not marked yet because not all
1066 * packets are spliced over to the driver pending
1067 * queue yet -- if this happened we acquire the lock
1068 * either before or after the splice happens, but
1069 * need to recheck which of these cases happened.
1070 *
1071 * 2) during session teardown, if the OPERATIONAL bit
1072 * was cleared due to the teardown but the pointer
1073 * hasn't been assigned NULL yet (or we loaded it
1074 * before it was assigned) -- in this case it may
1075 * now be NULL which means we should just let the
1076 * packet pass through because splicing the frames
1077 * back is already done.
1078 */
40b275b6 1079 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
a622ab72
JB		 1080
1081 if (!tid_tx) {
1082 /* do nothing, let packet pass through */
1083 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1084 info->flags |= IEEE80211_TX_CTL_AMPDU;
285fa695 1085 reset_agg_timer = true;
a622ab72
JB		 1086 } else {
1087 queued = true;
1088 info->control.vif = &tx->sdata->vif;
1089 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1090 __skb_queue_tail(&tid_tx->pending, skb);
aa454580
HS		 1091 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1092 purge_skb = __skb_dequeue(&tid_tx->pending);
a622ab72
JB		 1093 }
1094 spin_unlock(&tx->sta->lock);
aa454580
HS		 1095
1096 if (purge_skb)
c3e7724b 1097 ieee80211_free_txskb(&tx->local->hw, purge_skb);
a622ab72
JB		 1098 }
1099
285fa695
NM		 1100 /* reset session timer */
1101 if (reset_agg_timer && tid_tx->timeout)
12d3952f 1102 tid_tx->last_tx = jiffies;
285fa695 1103
a622ab72
JB		 1104 return queued;
1105}
1106
58d4185e
JB		 1107/*
1108 * initialises @tx
1109 */
9ae54c84 1110static ieee80211_tx_result
3b8d81e0
JB		 1111ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1112 struct ieee80211_tx_data *tx,
1113 struct sk_buff *skb)
e2ebc74d 1114{
3b8d81e0 1115 struct ieee80211_local *local = sdata->local;
58d4185e 1116 struct ieee80211_hdr *hdr;
e039fa4a 1117 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
68f2b517 1118 int tid;
a622ab72 1119 u8 *qc;
e2ebc74d
JB		 1120
1121 memset(tx, 0, sizeof(*tx));
1122 tx->skb = skb;
e2ebc74d 1123 tx->local = local;
3b8d81e0 1124 tx->sdata = sdata;
252b86c4 1125 __skb_queue_head_init(&tx->skbs);
e2ebc74d 1126
cd8ffc80
JB		 1127 /*
1128 * If this flag is set to true anywhere, and we get here,
1129 * we are doing the needed processing, so remove the flag
1130 * now.
1131 */
1132 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1133
58d4185e
JB		 1134 hdr = (struct ieee80211_hdr *) skb->data;
1135
3f0e0b22 1136 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
f14543ee 1137 tx->sta = rcu_dereference(sdata->u.vlan.sta);
3f0e0b22
FF		 1138 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1139 return TX_DROP;
66f2c99a
FF		 1140 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1141 tx->sdata->control_port_protocol == tx->skb->protocol) {
b4d57adb 1142 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
3f0e0b22 1143 }
f14543ee 1144 if (!tx->sta)
abe60632 1145 tx->sta = sta_info_get(sdata, hdr->addr1);
58d4185e 1146
cd8ffc80 1147 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
49a59543 1148 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
edf6b784
AN		 1149 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1150 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
cd8ffc80
JB		 1151 struct tid_ampdu_tx *tid_tx;
1152
8b30b1fe
S		 1153 qc = ieee80211_get_qos_ctl(hdr);
1154 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1155
a622ab72
JB		 1156 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1157 if (tid_tx) {
1158 bool queued;
cd8ffc80 1159
a622ab72
JB		 1160 queued = ieee80211_tx_prep_agg(tx, skb, info,
1161 tid_tx, tid);
1162
1163 if (unlikely(queued))
1164 return TX_QUEUED;
1165 }
8b30b1fe
S		 1166 }
1167
badffb72 1168 if (is_multicast_ether_addr(hdr->addr1)) {
5cf121c3 1169 tx->flags &= ~IEEE80211_TX_UNICAST;
e039fa4a 1170 info->flags |= IEEE80211_TX_CTL_NO_ACK;
6fd67e93 1171 } else
5cf121c3 1172 tx->flags |= IEEE80211_TX_UNICAST;
58d4185e 1173
a26eb27a
JB		 1174 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1175 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1176 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1177 info->flags & IEEE80211_TX_CTL_AMPDU)
1178 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
58d4185e
JB		 1179 }
1180
e2ebc74d 1181 if (!tx->sta)
e039fa4a 1182 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
c2c98fde 1183 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
e039fa4a 1184 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
58d4185e 1185
e039fa4a 1186 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
e2ebc74d 1187
9ae54c84 1188 return TX_CONTINUE;
e2ebc74d
JB		 1189}
1190
11127e91
JB		 1191static bool ieee80211_tx_frags(struct ieee80211_local *local,
1192 struct ieee80211_vif *vif,
1193 struct ieee80211_sta *sta,
1194 struct sk_buff_head *skbs,
1195 bool txpending)
e2ebc74d 1196{
36323f81 1197 struct ieee80211_tx_control control;
252b86c4 1198 struct sk_buff *skb, *tmp;
3b8d81e0 1199 unsigned long flags;
e2ebc74d 1200
252b86c4 1201 skb_queue_walk_safe(skbs, skb, tmp) {
3a25a8c8
JB		 1202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1203 int q = info->hw_queue;
1204
1205#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1206 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1207 __skb_unlink(skb, skbs);
c3e7724b 1208 ieee80211_free_txskb(&local->hw, skb);
3a25a8c8
JB		 1209 continue;
1210 }
1211#endif
3b8d81e0
JB		 1212
1213 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3b8d81e0 1214 if (local->queue_stop_reasons[q] ||
7bb45683
JB		 1215 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1216 /*
1217 * Since queue is stopped, queue up frames for later
1218 * transmission from the tx-pending tasklet when the
1219 * queue is woken again.
1220 */
252b86c4 1221 if (txpending)
4db4e0a1 1222 skb_queue_splice_init(skbs, &local->pending[q]);
252b86c4 1223 else
4db4e0a1
JB		 1224 skb_queue_splice_tail_init(skbs,
1225 &local->pending[q]);
7bb45683
JB		 1226
1227 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1228 flags);
1229 return false;
1230 }
3b8d81e0 1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
f8e79ddd 1232
11127e91 1233 info->control.vif = vif;
36323f81 1234 control.sta = sta;
f0e72851 1235
11127e91 1236 __skb_unlink(skb, skbs);
36323f81 1237 drv_tx(local, &control, skb);
11127e91 1238 }
5061b0c2 1239
11127e91
JB		 1240 return true;
1241}
1242
1243/*
1244 * Returns false if the frame couldn't be transmitted but was queued instead.
1245 */
1246static bool __ieee80211_tx(struct ieee80211_local *local,
1247 struct sk_buff_head *skbs, int led_len,
1248 struct sta_info *sta, bool txpending)
1249{
1250 struct ieee80211_tx_info *info;
1251 struct ieee80211_sub_if_data *sdata;
1252 struct ieee80211_vif *vif;
1253 struct ieee80211_sta *pubsta;
1254 struct sk_buff *skb;
1255 bool result = true;
1256 __le16 fc;
5061b0c2 1257
11127e91
JB		 1258 if (WARN_ON(skb_queue_empty(skbs)))
1259 return true;
ec25acc4 1260
11127e91
JB		 1261 skb = skb_peek(skbs);
1262 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1263 info = IEEE80211_SKB_CB(skb);
1264 sdata = vif_to_sdata(info->control.vif);
1265 if (sta && !sta->uploaded)
1266 sta = NULL;
1267
1268 if (sta)
1269 pubsta = &sta->sta;
1270 else
1271 pubsta = NULL;
1272
1273 switch (sdata->vif.type) {
1274 case NL80211_IFTYPE_MONITOR:
4b6f1dd6 1275 sdata = rcu_dereference(local->monitor_sdata);
3a25a8c8 1276 if (sdata) {
4b6f1dd6 1277 vif = &sdata->vif;
3a25a8c8
JB		 1278 info->hw_queue =
1279 vif->hw_queue[skb_get_queue_mapping(skb)];
1280 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1281 dev_kfree_skb(skb);
1282 return true;
1283 } else
4b6f1dd6 1284 vif = NULL;
11127e91
JB		 1285 break;
1286 case NL80211_IFTYPE_AP_VLAN:
1287 sdata = container_of(sdata->bss,
1288 struct ieee80211_sub_if_data, u.ap);
1289 /* fall through */
1290 default:
1291 vif = &sdata->vif;
1292 break;
e2ebc74d 1293 }
2de8e0d9 1294
cb831b53
JB		 1295 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1296 txpending);
11127e91 1297
74e4dbfd
JB		 1298 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1299 ieee80211_led_tx(local, 1);
1300
4db4e0a1 1301 WARN_ON_ONCE(!skb_queue_empty(skbs));
252b86c4 1302
11127e91 1303 return result;
e2ebc74d
JB		 1304}
1305
97b045d6
JB		 1306/*
1307 * Invoke TX handlers, return 0 on success and non-zero if the
1308 * frame was dropped or queued.
1309 */
1310static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1311{
252b86c4 1312 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
97b045d6 1313 ieee80211_tx_result res = TX_DROP;
97b045d6 1314
9aa4aee3
JB		 1315#define CALL_TXH(txh) \
1316 do { \
1317 res = txh(tx); \
1318 if (res != TX_CONTINUE) \
1319 goto txh_done; \
1320 } while (0)
1321
5c1b98a5 1322 CALL_TXH(ieee80211_tx_h_dynamic_ps);
9aa4aee3
JB		 1323 CALL_TXH(ieee80211_tx_h_check_assoc);
1324 CALL_TXH(ieee80211_tx_h_ps_buf);
a621fa4d 1325 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
9aa4aee3 1326 CALL_TXH(ieee80211_tx_h_select_key);
af65cd96
JB		 1327 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1328 CALL_TXH(ieee80211_tx_h_rate_ctrl);
c6fcf6bc 1329
aa5b5492
JB		 1330 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1331 __skb_queue_tail(&tx->skbs, tx->skb);
1332 tx->skb = NULL;
c6fcf6bc 1333 goto txh_done;
aa5b5492 1334 }
c6fcf6bc
JB		 1335
1336 CALL_TXH(ieee80211_tx_h_michael_mic_add);
9aa4aee3
JB		 1337 CALL_TXH(ieee80211_tx_h_sequence);
1338 CALL_TXH(ieee80211_tx_h_fragment);
d9e8a70f 1339 /* handlers after fragment must be aware of tx info fragmentation! */
9aa4aee3
JB		 1340 CALL_TXH(ieee80211_tx_h_stats);
1341 CALL_TXH(ieee80211_tx_h_encrypt);
8fd369ee
AN		 1342 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1343 CALL_TXH(ieee80211_tx_h_calculate_duration);
d9e8a70f 1344#undef CALL_TXH
97b045d6 1345
d9e8a70f 1346 txh_done:
97b045d6 1347 if (unlikely(res == TX_DROP)) {
5479d0e7 1348 I802_DEBUG_INC(tx->local->tx_handlers_drop);
252b86c4 1349 if (tx->skb)
c3e7724b 1350 ieee80211_free_txskb(&tx->local->hw, tx->skb);
252b86c4
JB		 1351 else
1352 __skb_queue_purge(&tx->skbs);
97b045d6
JB		 1353 return -1;
1354 } else if (unlikely(res == TX_QUEUED)) {
5479d0e7 1355 I802_DEBUG_INC(tx->local->tx_handlers_queued);
97b045d6
JB		 1356 return -1;
1357 }
1358
1359 return 0;
1360}
1361
7bb45683
JB		 1362/*
1363 * Returns false if the frame couldn't be transmitted but was queued instead.
1364 */
1365static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
55de908a
JB		 1366 struct sk_buff *skb, bool txpending,
1367 enum ieee80211_band band)
e2ebc74d 1368{
3b8d81e0 1369 struct ieee80211_local *local = sdata->local;
5cf121c3 1370 struct ieee80211_tx_data tx;
97b045d6 1371 ieee80211_tx_result res_prepare;
e039fa4a 1372 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
7bb45683 1373 bool result = true;
74e4dbfd 1374 int led_len;
e2ebc74d 1375
e2ebc74d
JB		 1376 if (unlikely(skb->len < 10)) {
1377 dev_kfree_skb(skb);
7bb45683 1378 return true;
e2ebc74d
JB		 1379 }
1380
58d4185e 1381 /* initialises tx */
74e4dbfd 1382 led_len = skb->len;
3b8d81e0 1383 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
e2ebc74d 1384
cd8ffc80 1385 if (unlikely(res_prepare == TX_DROP)) {
c3e7724b 1386 ieee80211_free_txskb(&local->hw, skb);
55de908a 1387 return true;
cd8ffc80 1388 } else if (unlikely(res_prepare == TX_QUEUED)) {
55de908a 1389 return true;
e2ebc74d
JB		 1390 }
1391
55de908a 1392 info->band = band;
e2ebc74d 1393
3a25a8c8
JB		 1394 /* set up hw_queue value early */
1395 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1396 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1397 info->hw_queue =
1398 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1399
7bb45683 1400 if (!invoke_tx_handlers(&tx))
74e4dbfd
JB		 1401 result = __ieee80211_tx(local, &tx.skbs, led_len,
1402 tx.sta, txpending);
55de908a 1403
7bb45683 1404 return result;
e2ebc74d
JB		 1405}
1406
1407/* device xmit handlers */
1408
3bff1865 1409static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
23c0752a
JB		 1410 struct sk_buff *skb,
1411 int head_need, bool may_encrypt)
1412{
3bff1865 1413 struct ieee80211_local *local = sdata->local;
23c0752a
JB		 1414 int tail_need = 0;
1415
3bff1865 1416 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
23c0752a
JB		 1417 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1418 tail_need -= skb_tailroom(skb);
1419 tail_need = max_t(int, tail_need, 0);
1420 }
1421
fc7c976d 1422 if (skb_cloned(skb))
23c0752a 1423 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
4cd06a34 1424 else if (head_need || tail_need)
23c0752a 1425 I802_DEBUG_INC(local->tx_expand_skb_head);
4cd06a34
FF		 1426 else
1427 return 0;
23c0752a
JB		 1428
1429 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
0fb9a9ec
JP		 1430 wiphy_debug(local->hw.wiphy,
1431 "failed to reallocate TX buffer\n");
23c0752a
JB		 1432 return -ENOMEM;
1433 }
1434
23c0752a
JB		 1435 return 0;
1436}
1437
55de908a
JB		 1438void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1439 enum ieee80211_band band)
e2ebc74d 1440{
3b8d81e0 1441 struct ieee80211_local *local = sdata->local;
e039fa4a 1442 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
e32f85f7 1443 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
e2ebc74d 1444 int headroom;
23c0752a 1445 bool may_encrypt;
e2ebc74d 1446
3b8d81e0 1447 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
23c0752a 1448
3b8d81e0 1449 headroom = local->tx_headroom;
23c0752a
JB		 1450 if (may_encrypt)
1451 headroom += IEEE80211_ENCRYPT_HEADROOM;
1452 headroom -= skb_headroom(skb);
1453 headroom = max_t(int, 0, headroom);
1454
3bff1865 1455 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
c3e7724b 1456 ieee80211_free_txskb(&local->hw, skb);
3b8d81e0 1457 return;
e2ebc74d
JB		 1458 }
1459
740c1aa3 1460 hdr = (struct ieee80211_hdr *) skb->data;
5061b0c2 1461 info->control.vif = &sdata->vif;
e2ebc74d 1462
cca89496
JC		 1463 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1464 ieee80211_is_data(hdr->frame_control) &&
98aed9fd
JB		 1465 !is_multicast_ether_addr(hdr->addr1) &&
1466 mesh_nexthop_resolve(skb, sdata)) {
1467 /* skb queued: don't free */
98aed9fd
JB		 1468 return;
1469 }
cca89496 1470
2154c81c 1471 ieee80211_set_qos_hdr(sdata, skb);
55de908a 1472 ieee80211_tx(sdata, skb, false, band);
e2ebc74d
JB		 1473}
1474
73b9f03a
JB		 1475static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1476{
1477 struct ieee80211_radiotap_iterator iterator;
1478 struct ieee80211_radiotap_header *rthdr =
1479 (struct ieee80211_radiotap_header *) skb->data;
1480 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1481 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1482 NULL);
1483 u16 txflags;
1484
1485 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1486 IEEE80211_TX_CTL_DONTFRAG;
1487
1488 /*
1489 * for every radiotap entry that is present
1490 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1491 * entries present, or -EINVAL on error)
1492 */
1493
1494 while (!ret) {
1495 ret = ieee80211_radiotap_iterator_next(&iterator);
1496
1497 if (ret)
1498 continue;
1499
1500 /* see if this argument is something we can use */
1501 switch (iterator.this_arg_index) {
1502 /*
1503 * You must take care when dereferencing iterator.this_arg
1504 * for multibyte types... the pointer is not aligned. Use
1505 * get_unaligned((type *)iterator.this_arg) to dereference
1506 * iterator.this_arg for type "type" safely on all arches.
1507 */
1508 case IEEE80211_RADIOTAP_FLAGS:
1509 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1510 /*
1511 * this indicates that the skb we have been
1512 * handed has the 32-bit FCS CRC at the end...
1513 * we should react to that by snipping it off
1514 * because it will be recomputed and added
1515 * on transmission
1516 */
1517 if (skb->len < (iterator._max_length + FCS_LEN))
1518 return false;
1519
1520 skb_trim(skb, skb->len - FCS_LEN);
1521 }
1522 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1523 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1524 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1525 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1526 break;
1527
1528 case IEEE80211_RADIOTAP_TX_FLAGS:
1529 txflags = get_unaligned_le16(iterator.this_arg);
1530 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1531 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1532 break;
1533
1534 /*
1535 * Please update the file
1536 * Documentation/networking/mac80211-injection.txt
1537 * when parsing new fields here.
1538 */
1539
1540 default:
1541 break;
1542 }
1543 }
1544
1545 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1546 return false;
1547
1548 /*
1549 * remove the radiotap header
1550 * iterator->_max_length was sanity-checked against
1551 * skb->len by iterator init
1552 */
1553 skb_pull(skb, iterator._max_length);
1554
1555 return true;
1556}
1557
d0cf9c0d
SH		 1558netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1559 struct net_device *dev)
e2ebc74d
JB		 1560{
1561 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
55de908a
JB		 1562 struct ieee80211_chanctx_conf *chanctx_conf;
1563 struct ieee80211_channel *chan;
e2ebc74d
JB		 1564 struct ieee80211_radiotap_header *prthdr =
1565 (struct ieee80211_radiotap_header *)skb->data;
3b8d81e0 1566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
f75f5c6f 1567 struct ieee80211_hdr *hdr;
5d9cf4a5 1568 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
9b8a74e3 1569 u16 len_rthdr;
5d9cf4a5 1570 int hdrlen;
e2ebc74d 1571
9b8a74e3
AG		 1572 /* check for not even having the fixed radiotap header part */
1573 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1574 goto fail; /* too short to be possibly valid */
1575
1576 /* is it a header version we can trust to find length from? */
1577 if (unlikely(prthdr->it_version))
1578 goto fail; /* only version 0 is supported */
1579
1580 /* then there must be a radiotap header with a length we can use */
1581 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1582
1583 /* does the skb contain enough to deliver on the alleged length? */
1584 if (unlikely(skb->len < len_rthdr))
1585 goto fail; /* skb too short for claimed rt header extent */
e2ebc74d 1586
e2ebc74d
JB		 1587 /*
1588 * fix up the pointers accounting for the radiotap
1589 * header still being in there. We are being given
1590 * a precooked IEEE80211 header so no need for
1591 * normal processing
1592 */
9b8a74e3 1593 skb_set_mac_header(skb, len_rthdr);
e2ebc74d 1594 /*
9b8a74e3
AG		 1595 * these are just fixed to the end of the rt area since we
1596 * don't have any better information and at this point, nobody cares
e2ebc74d 1597 */
9b8a74e3
AG		 1598 skb_set_network_header(skb, len_rthdr);
1599 skb_set_transport_header(skb, len_rthdr);
e2ebc74d 1600
5d9cf4a5
JB		 1601 if (skb->len < len_rthdr + 2)
1602 goto fail;
1603
1604 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1605 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1606
1607 if (skb->len < len_rthdr + hdrlen)
1608 goto fail;
1609
f75f5c6f
HS		 1610 /*
1611 * Initialize skb->protocol if the injected frame is a data frame
1612 * carrying a rfc1042 header
1613 */
5d9cf4a5
JB		 1614 if (ieee80211_is_data(hdr->frame_control) &&
1615 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1616 u8 *payload = (u8 *)hdr + hdrlen;
1617
b203ca39 1618 if (ether_addr_equal(payload, rfc1042_header))
5d9cf4a5
JB		 1619 skb->protocol = cpu_to_be16((payload[6] << 8) |
1620 payload[7]);
f75f5c6f
HS		 1621 }
1622
3b8d81e0
JB		 1623 memset(info, 0, sizeof(*info));
1624
5d9cf4a5 1625 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
73b9f03a
JB		 1626 IEEE80211_TX_CTL_INJECTED;
1627
1628 /* process and remove the injection radiotap header */
1629 if (!ieee80211_parse_tx_radiotap(skb))
1630 goto fail;
5d9cf4a5
JB		 1631
1632 rcu_read_lock();
1633
1634 /*
1635 * We process outgoing injected frames that have a local address
1636 * we handle as though they are non-injected frames.
1637 * This code here isn't entirely correct, the local MAC address
1638 * isn't always enough to find the interface to use; for proper
1639 * VLAN/WDS support we will need a different mechanism (which
1640 * likely isn't going to be monitor interfaces).
1641 */
1642 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1643
1644 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1645 if (!ieee80211_sdata_running(tmp_sdata))
1646 continue;
1647 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1648 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1649 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1650 continue;
b203ca39 1651 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
5d9cf4a5
JB		 1652 sdata = tmp_sdata;
1653 break;
1654 }
1655 }
7351c6bd 1656
55de908a
JB		 1657 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1658 if (!chanctx_conf) {
1659 tmp_sdata = rcu_dereference(local->monitor_sdata);
1660 if (tmp_sdata)
1661 chanctx_conf =
1662 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1663 }
1664 if (!chanctx_conf)
1665 goto fail_rcu;
1666
1667 chan = chanctx_conf->channel;
1668
1669 /*
1670 * Frame injection is not allowed if beaconing is not allowed
1671 * or if we need radar detection. Beaconing is usually not allowed when
1672 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1673 * Passive scan is also used in world regulatory domains where
1674 * your country is not known and as such it should be treated as
1675 * NO TX unless the channel is explicitly allowed in which case
1676 * your current regulatory domain would not have the passive scan
1677 * flag.
1678 *
1679 * Since AP mode uses monitor interfaces to inject/TX management
1680 * frames we can make AP mode the exception to this rule once it
1681 * supports radar detection as its implementation can deal with
1682 * radar detection by itself. We can do that later by adding a
1683 * monitor flag interfaces used for AP support.
1684 */
1685 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1686 IEEE80211_CHAN_PASSIVE_SCAN)))
1687 goto fail_rcu;
1688
1689 ieee80211_xmit(sdata, skb, chan->band);
5d9cf4a5
JB		 1690 rcu_read_unlock();
1691
e2ebc74d 1692 return NETDEV_TX_OK;
9b8a74e3 1693
55de908a
JB		 1694fail_rcu:
1695 rcu_read_unlock();
9b8a74e3
AG		 1696fail:
1697 dev_kfree_skb(skb);
1698 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
e2ebc74d
JB		 1699}
1700
1701/**
1702 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1703 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1704 * @skb: packet to be sent
1705 * @dev: incoming interface
1706 *
1707 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1708 * not be freed, and caller is responsible for either retrying later or freeing
1709 * skb).
1710 *
1711 * This function takes in an Ethernet header and encapsulates it with suitable
1712 * IEEE 802.11 header based on which interface the packet is coming in. The
1713 * encapsulated packet will then be passed to master interface, wlan#.11, for
1714 * transmission (through low-level driver).
1715 */
d0cf9c0d
SH		 1716netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1717 struct net_device *dev)
e2ebc74d 1718{
133b8226
JB		 1719 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1720 struct ieee80211_local *local = sdata->local;
489ee919 1721 struct ieee80211_tx_info *info;
dcf33963 1722 int head_need;
065e9605
HH		 1723 u16 ethertype, hdrlen, meshhdrlen = 0;
1724 __le16 fc;
e2ebc74d 1725 struct ieee80211_hdr hdr;
ff67bb86 1726 struct ieee80211s_hdr mesh_hdr __maybe_unused;
b8bacc18 1727 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
e2ebc74d
JB		 1728 const u8 *encaps_data;
1729 int encaps_len, skip_header_bytes;
e8bf9649 1730 int nh_pos, h_pos;
f14543ee 1731 struct sta_info *sta = NULL;
c2c98fde 1732 bool wme_sta = false, authorized = false, tdls_auth = false;
941c93cd 1733 bool tdls_direct = false;
a729cff8
JB		 1734 bool multicast;
1735 u32 info_flags = 0;
1736 u16 info_id = 0;
55de908a
JB		 1737 struct ieee80211_chanctx_conf *chanctx_conf;
1738 struct ieee80211_sub_if_data *ap_sdata;
1739 enum ieee80211_band band;
e2ebc74d 1740
dcf33963 1741 if (unlikely(skb->len < ETH_HLEN))
e2ebc74d 1742 goto fail;
e2ebc74d 1743
e2ebc74d
JB		 1744 /* convert Ethernet header to proper 802.11 header (based on
1745 * operation mode) */
1746 ethertype = (skb->data[12] << 8) | skb->data[13];
065e9605 1747 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
e2ebc74d 1748
55de908a
JB		 1749 rcu_read_lock();
1750
51fb61e7 1751 switch (sdata->vif.type) {
05c914fe 1752 case NL80211_IFTYPE_AP_VLAN:
9bc383de 1753 sta = rcu_dereference(sdata->u.vlan.sta);
f14543ee
FF		 1754 if (sta) {
1755 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1756 /* RA TA DA SA */
1757 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
47846c9b 1758 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1759 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1760 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1761 hdrlen = 30;
c2c98fde
JB		 1762 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1763 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
f14543ee 1764 }
55de908a
JB		 1765 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1766 u.ap);
1767 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1768 if (!chanctx_conf)
1769 goto fail_rcu;
1770 band = chanctx_conf->channel->band;
f14543ee
FF		 1771 if (sta)
1772 break;
1773 /* fall through */
1774 case NL80211_IFTYPE_AP:
065e9605 1775 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
e2ebc74d
JB		 1776 /* DA BSSID SA */
1777 memcpy(hdr.addr1, skb->data, ETH_ALEN);
47846c9b 1778 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1779 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1780 hdrlen = 24;
55de908a
JB		 1781 if (sdata->vif.type == NL80211_IFTYPE_AP)
1782 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1783 if (!chanctx_conf)
1784 goto fail_rcu;
1785 band = chanctx_conf->channel->band;
cf966838 1786 break;
05c914fe 1787 case NL80211_IFTYPE_WDS:
065e9605 1788 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
e2ebc74d
JB		 1789 /* RA TA DA SA */
1790 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
47846c9b 1791 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
e2ebc74d
JB		 1792 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1793 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1794 hdrlen = 30;
55de908a
JB		 1795 /*
1796 * This is the exception! WDS style interfaces are prohibited
1797 * when channel contexts are in used so this must be valid
1798 */
1799 band = local->hw.conf.channel->band;
cf966838 1800 break;
33b64eb2 1801#ifdef CONFIG_MAC80211_MESH
05c914fe 1802 case NL80211_IFTYPE_MESH_POINT:
472dbc45 1803 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
e32f85f7 1804 /* Do not send frames with mesh_ttl == 0 */
472dbc45 1805 sdata->u.mesh.mshstats.dropped_frames_ttl++;
55de908a 1806 goto fail_rcu;
33b64eb2 1807 }
55de908a 1808
b8bacc18
CYY		 1809 if (!is_multicast_ether_addr(skb->data)) {
1810 mpath = mesh_path_lookup(skb->data, sdata);
1811 if (!mpath)
1812 mppath = mpp_path_lookup(skb->data, sdata);
1813 }
79617dee 1814
f76b57b4 1815 /*
9d52501b
JF		 1816 * Use address extension if it is a packet from
1817 * another interface or if we know the destination
1818 * is being proxied by a portal (i.e. portal address
1819 * differs from proxied address)
f76b57b4 1820 */
b203ca39
JP		 1821 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1822 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
3c5772a5
JC		 1823 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1824 skb->data, skb->data + ETH_ALEN);
1825 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
61ad5394 1826 sdata, NULL, NULL);
79617dee 1827 } else {
27f01124
TP		 1828 /* DS -> MBSS (802.11-2012 13.11.3.3).
1829 * For unicast with unknown forwarding information,
1830 * destination might be in the MBSS or if that fails
1831 * forwarded to another mesh gate. In either case
1832 * resolution will be handled in ieee80211_xmit(), so
1833 * leave the original DA. This also works for mcast */
1834 const u8 *mesh_da = skb->data;
1835
1836 if (mppath)
1837 mesh_da = mppath->mpp;
1838 else if (mpath)
1839 mesh_da = mpath->dst;
79617dee 1840
3c5772a5 1841 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
47846c9b 1842 mesh_da, sdata->vif.addr);
27f01124
TP		 1843 if (is_multicast_ether_addr(mesh_da))
1844 /* DA TA mSA AE:SA */
3c5772a5
JC		 1845 meshhdrlen =
1846 ieee80211_new_mesh_header(&mesh_hdr,
1847 sdata,
1848 skb->data + ETH_ALEN,
3c5772a5
JC		 1849 NULL);
1850 else
27f01124 1851 /* RA TA mDA mSA AE:DA SA */
3c5772a5
JC		 1852 meshhdrlen =
1853 ieee80211_new_mesh_header(&mesh_hdr,
1854 sdata,
3c5772a5
JC		 1855 skb->data,
1856 skb->data + ETH_ALEN);
79617dee 1857
79617dee 1858 }
55de908a
JB		 1859 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1860 if (!chanctx_conf)
1861 goto fail_rcu;
1862 band = chanctx_conf->channel->band;
33b64eb2
LCC		 1863 break;
1864#endif
05c914fe 1865 case NL80211_IFTYPE_STATION:
941c93cd 1866 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
c2c98fde
JB		 1867 bool tdls_peer = false;
1868
941c93cd 1869 sta = sta_info_get(sdata, skb->data);
c2c98fde
JB		 1870 if (sta) {
1871 authorized = test_sta_flag(sta,
1872 WLAN_STA_AUTHORIZED);
1873 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1874 tdls_peer = test_sta_flag(sta,
1875 WLAN_STA_TDLS_PEER);
1876 tdls_auth = test_sta_flag(sta,
1877 WLAN_STA_TDLS_PEER_AUTH);
1878 }
941c93cd
AN		 1879
1880 /*
1881 * If the TDLS link is enabled, send everything
1882 * directly. Otherwise, allow TDLS setup frames
1883 * to be transmitted indirectly.
1884 */
c2c98fde 1885 tdls_direct = tdls_peer && (tdls_auth ||
941c93cd
AN		 1886 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1887 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1888 }
1889
1890 if (tdls_direct) {
1891 /* link during setup - throw out frames to peer */
dcf33963 1892 if (!tdls_auth)
55de908a 1893 goto fail_rcu;
941c93cd
AN		 1894
1895 /* DA SA BSSID */
1896 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1897 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1898 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1899 hdrlen = 24;
1900 } else if (sdata->u.mgd.use_4addr &&
1901 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1902 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1903 IEEE80211_FCTL_TODS);
f14543ee 1904 /* RA TA DA SA */
941c93cd 1905 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
47846c9b 1906 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
f14543ee
FF		 1907 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1908 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1909 hdrlen = 30;
1910 } else {
1911 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1912 /* BSSID SA DA */
941c93cd 1913 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
f14543ee
FF		 1914 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1915 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1916 hdrlen = 24;
1917 }
55de908a
JB		 1918 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1919 if (!chanctx_conf)
1920 goto fail_rcu;
1921 band = chanctx_conf->channel->band;
cf966838 1922 break;
05c914fe 1923 case NL80211_IFTYPE_ADHOC:
e2ebc74d
JB		 1924 /* DA SA BSSID */
1925 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1926 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
46900298 1927 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
e2ebc74d 1928 hdrlen = 24;
55de908a
JB		 1929 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1930 if (!chanctx_conf)
1931 goto fail_rcu;
1932 band = chanctx_conf->channel->band;
cf966838
JB		 1933 break;
1934 default:
55de908a 1935 goto fail_rcu;
e2ebc74d
JB		 1936 }
1937
7d185b8b
JB		 1938 /*
1939 * There's no need to try to look up the destination
1940 * if it is a multicast address (which can only happen
1941 * in AP mode)
1942 */
a729cff8
JB		 1943 multicast = is_multicast_ether_addr(hdr.addr1);
1944 if (!multicast) {
abe60632 1945 sta = sta_info_get(sdata, hdr.addr1);
c2c98fde
JB		 1946 if (sta) {
1947 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1948 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1949 }
e2ebc74d
JB		 1950 }
1951
4777be41
JC		 1952 /* For mesh, the use of the QoS header is mandatory */
1953 if (ieee80211_vif_is_mesh(&sdata->vif))
c2c98fde 1954 wme_sta = true;
4777be41 1955
3434fbd3 1956 /* receiver and we are QoS enabled, use a QoS type frame */
32c5057b 1957 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
065e9605 1958 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
ce3edf6d
JB		 1959 hdrlen += 2;
1960 }
1961
1962 /*
238814fd
JB		 1963 * Drop unicast frames to unauthorised stations unless they are
1964 * EAPOL frames from the local station.
ce3edf6d 1965 */
55182e4a
JB		 1966 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1967 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1968 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
b203ca39 1969 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
ce3edf6d 1970#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
bdcbd8e0 1971 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
e87cc472 1972 dev->name, hdr.addr1);
ce3edf6d
JB		 1973#endif
1974
1975 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1976
55de908a 1977 goto fail_rcu;
ce3edf6d
JB		 1978 }
1979
a729cff8
JB		 1980 if (unlikely(!multicast && skb->sk &&
1981 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1982 struct sk_buff *orig_skb = skb;
1983
1984 skb = skb_clone(skb, GFP_ATOMIC);
1985 if (skb) {
1986 unsigned long flags;
1987 int id, r;
1988
1989 spin_lock_irqsave(&local->ack_status_lock, flags);
1990 r = idr_get_new_above(&local->ack_status_frames,
1991 orig_skb, 1, &id);
1992 if (r == -EAGAIN) {
1993 idr_pre_get(&local->ack_status_frames,
1994 GFP_ATOMIC);
1995 r = idr_get_new_above(&local->ack_status_frames,
1996 orig_skb, 1, &id);
1997 }
1998 if (WARN_ON(!id) || id > 0xffff) {
1999 idr_remove(&local->ack_status_frames, id);
2000 r = -ERANGE;
2001 }
2002 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2003
2004 if (!r) {
2005 info_id = id;
2006 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2007 } else if (skb_shared(skb)) {
2008 kfree_skb(orig_skb);
2009 } else {
2010 kfree_skb(skb);
2011 skb = orig_skb;
2012 }
2013 } else {
2014 /* couldn't clone -- lose tx status ... */
2015 skb = orig_skb;
2016 }
2017 }
2018
7e244707
HS		 2019 /*
2020 * If the skb is shared we need to obtain our own copy.
2021 */
2022 if (skb_shared(skb)) {
a729cff8
JB		 2023 struct sk_buff *tmp_skb = skb;
2024
2025 /* can't happen -- skb is a clone if info_id != 0 */
2026 WARN_ON(info_id);
2027
f8a0a781 2028 skb = skb_clone(skb, GFP_ATOMIC);
7e244707
HS		 2029 kfree_skb(tmp_skb);
2030
dcf33963 2031 if (!skb)
55de908a 2032 goto fail_rcu;
7e244707
HS		 2033 }
2034
065e9605 2035 hdr.frame_control = fc;
e2ebc74d
JB		 2036 hdr.duration_id = 0;
2037 hdr.seq_ctrl = 0;
2038
2039 skip_header_bytes = ETH_HLEN;
2040 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2041 encaps_data = bridge_tunnel_header;
2042 encaps_len = sizeof(bridge_tunnel_header);
2043 skip_header_bytes -= 2;
2044 } else if (ethertype >= 0x600) {
2045 encaps_data = rfc1042_header;
2046 encaps_len = sizeof(rfc1042_header);
2047 skip_header_bytes -= 2;
2048 } else {
2049 encaps_data = NULL;
2050 encaps_len = 0;
2051 }
2052
7e244707
HS		 2053 nh_pos = skb_network_header(skb) - skb->data;
2054 h_pos = skb_transport_header(skb) - skb->data;
2055
e2ebc74d
JB		 2056 skb_pull(skb, skip_header_bytes);
2057 nh_pos -= skip_header_bytes;
2058 h_pos -= skip_header_bytes;
2059
23c0752a 2060 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
e2ebc74d 2061
23c0752a
JB		 2062 /*
2063 * So we need to modify the skb header and hence need a copy of
2064 * that. The head_need variable above doesn't, so far, include
2065 * the needed header space that we don't need right away. If we
2066 * can, then we don't reallocate right now but only after the
2067 * frame arrives at the master device (if it does...)
2068 *
2069 * If we cannot, however, then we will reallocate to include all
2070 * the ever needed space. Also, if we need to reallocate it anyway,
2071 * make it big enough for everything we may ever need.
2072 */
e2ebc74d 2073
3a5be7d4 2074 if (head_need > 0 || skb_cloned(skb)) {
23c0752a
JB		 2075 head_need += IEEE80211_ENCRYPT_HEADROOM;
2076 head_need += local->tx_headroom;
2077 head_need = max_t(int, 0, head_need);
c3e7724b
FF		 2078 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2079 ieee80211_free_txskb(&local->hw, skb);
55de908a 2080 goto fail_rcu;
c3e7724b 2081 }
e2ebc74d
JB		 2082 }
2083
2084 if (encaps_data) {
2085 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2086 nh_pos += encaps_len;
2087 h_pos += encaps_len;
2088 }
c29b9b9b 2089
e4ab7eb0 2090#ifdef CONFIG_MAC80211_MESH
33b64eb2
LCC		 2091 if (meshhdrlen > 0) {
2092 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2093 nh_pos += meshhdrlen;
2094 h_pos += meshhdrlen;
2095 }
e4ab7eb0 2096#endif
33b64eb2 2097
065e9605 2098 if (ieee80211_is_data_qos(fc)) {
c29b9b9b
JB		 2099 __le16 *qos_control;
2100
2101 qos_control = (__le16*) skb_push(skb, 2);
2102 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2103 /*
2104 * Maybe we could actually set some fields here, for now just
2105 * initialise to zero to indicate no special operation.
2106 */
2107 *qos_control = 0;
2108 } else
2109 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2110
e2ebc74d
JB		 2111 nh_pos += hdrlen;
2112 h_pos += hdrlen;
2113
68aae116
SH		 2114 dev->stats.tx_packets++;
2115 dev->stats.tx_bytes += skb->len;
e2ebc74d
JB		 2116
2117 /* Update skb pointers to various headers since this modified frame
2118 * is going to go through Linux networking code that may potentially
2119 * need things like pointer to IP header. */
2120 skb_set_mac_header(skb, 0);
2121 skb_set_network_header(skb, nh_pos);
2122 skb_set_transport_header(skb, h_pos);
2123
489ee919 2124 info = IEEE80211_SKB_CB(skb);
3b8d81e0
JB		 2125 memset(info, 0, sizeof(*info));
2126
e2ebc74d 2127 dev->trans_start = jiffies;
a729cff8
JB		 2128
2129 info->flags = info_flags;
2130 info->ack_frame_id = info_id;
2131
55de908a
JB		 2132 ieee80211_xmit(sdata, skb, band);
2133 rcu_read_unlock();
e2ebc74d 2134
ec634fe3 2135 return NETDEV_TX_OK;
e2ebc74d 2136
55de908a
JB		 2137 fail_rcu:
2138 rcu_read_unlock();
e2ebc74d 2139 fail:
dcf33963
JB		 2140 dev_kfree_skb(skb);
2141 return NETDEV_TX_OK;
e2ebc74d
JB		 2142}
2143
e2ebc74d 2144
e2530083
JB		 2145/*
2146 * ieee80211_clear_tx_pending may not be called in a context where
2147 * it is possible that it packets could come in again.
2148 */
e2ebc74d
JB		 2149void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2150{
2de8e0d9 2151 int i;
e2ebc74d 2152
2a577d98
JB		 2153 for (i = 0; i < local->hw.queues; i++)
2154 skb_queue_purge(&local->pending[i]);
e2ebc74d
JB		 2155}
2156
7bb45683
JB		 2157/*
2158 * Returns false if the frame couldn't be transmitted but was queued instead,
2159 * which in this case means re-queued -- take as an indication to stop sending
2160 * more pending frames.
2161 */
cd8ffc80
JB		 2162static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2163 struct sk_buff *skb)
2164{
2165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2166 struct ieee80211_sub_if_data *sdata;
2167 struct sta_info *sta;
2168 struct ieee80211_hdr *hdr;
7bb45683 2169 bool result;
55de908a 2170 struct ieee80211_chanctx_conf *chanctx_conf;
cd8ffc80 2171
5061b0c2 2172 sdata = vif_to_sdata(info->control.vif);
cd8ffc80
JB		 2173
2174 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
55de908a
JB		 2175 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2176 if (unlikely(!chanctx_conf)) {
2177 dev_kfree_skb(skb);
2178 return true;
2179 }
2180 result = ieee80211_tx(sdata, skb, true,
2181 chanctx_conf->channel->band);
cd8ffc80 2182 } else {
252b86c4
JB		 2183 struct sk_buff_head skbs;
2184
2185 __skb_queue_head_init(&skbs);
2186 __skb_queue_tail(&skbs, skb);
2187
cd8ffc80 2188 hdr = (struct ieee80211_hdr *)skb->data;
abe60632 2189 sta = sta_info_get(sdata, hdr->addr1);
cd8ffc80 2190
74e4dbfd 2191 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
cd8ffc80
JB		 2192 }
2193
cd8ffc80
JB		 2194 return result;
2195}
2196
e2530083 2197/*
3b8d81e0 2198 * Transmit all pending packets. Called from tasklet.
e2530083 2199 */
e2ebc74d
JB		 2200void ieee80211_tx_pending(unsigned long data)
2201{
2202 struct ieee80211_local *local = (struct ieee80211_local *)data;
2a577d98 2203 unsigned long flags;
cd8ffc80 2204 int i;
3b8d81e0 2205 bool txok;
e2ebc74d 2206
f0e72851 2207 rcu_read_lock();
e2530083 2208
3b8d81e0 2209 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2a577d98
JB		 2210 for (i = 0; i < local->hw.queues; i++) {
2211 /*
2212 * If queue is stopped by something other than due to pending
2213 * frames, or we have no pending frames, proceed to next queue.
2214 */
3b8d81e0 2215 if (local->queue_stop_reasons[i] ||
2a577d98 2216 skb_queue_empty(&local->pending[i]))
e2ebc74d 2217 continue;
e2530083 2218
2a577d98 2219 while (!skb_queue_empty(&local->pending[i])) {
3b8d81e0 2220 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5061b0c2 2221 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5061b0c2 2222
a7bc376c 2223 if (WARN_ON(!info->control.vif)) {
c3e7724b 2224 ieee80211_free_txskb(&local->hw, skb);
a7bc376c
JB		 2225 continue;
2226 }
2227
3b8d81e0
JB		 2228 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2229 flags);
2230
2231 txok = ieee80211_tx_pending_skb(local, skb);
3b8d81e0
JB		 2232 spin_lock_irqsave(&local->queue_stop_reason_lock,
2233 flags);
2234 if (!txok)
2a577d98 2235 break;
e2ebc74d 2236 }
7236fe29
JB		 2237
2238 if (skb_queue_empty(&local->pending[i]))
3a25a8c8 2239 ieee80211_propagate_queue_wake(local, i);
e2ebc74d 2240 }
3b8d81e0 2241 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2a577d98 2242
f0e72851 2243 rcu_read_unlock();
e2ebc74d
JB		 2244}
2245
2246/* functions for drivers to get certain frames */
2247
8860020e
JB		 2248static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2249 struct ieee80211_if_ap *bss,
5dfdaf58
JB		 2250 struct sk_buff *skb,
2251 struct beacon_data *beacon)
e2ebc74d
JB		 2252{
2253 u8 *pos, *tim;
2254 int aid0 = 0;
2255 int i, have_bits = 0, n1, n2;
2256
2257 /* Generate bitmap for TIM only if there are any STAs in power save
2258 * mode. */
e2ebc74d
JB		 2259 if (atomic_read(&bss->num_sta_ps) > 0)
2260 /* in the hope that this is faster than
2261 * checking byte-for-byte */
2262 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2263 IEEE80211_MAX_AID+1);
2264
2265 if (bss->dtim_count == 0)
8860020e 2266 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
e2ebc74d
JB		 2267 else
2268 bss->dtim_count--;
2269
2270 tim = pos = (u8 *) skb_put(skb, 6);
2271 *pos++ = WLAN_EID_TIM;
2272 *pos++ = 4;
2273 *pos++ = bss->dtim_count;
8860020e 2274 *pos++ = sdata->vif.bss_conf.dtim_period;
e2ebc74d
JB		 2275
2276 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2277 aid0 = 1;
2278
512119b3
CL		 2279 bss->dtim_bc_mc = aid0 == 1;
2280
e2ebc74d
JB		 2281 if (have_bits) {
2282 /* Find largest even number N1 so that bits numbered 1 through
2283 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2284 * (N2 + 1) x 8 through 2007 are 0. */
2285 n1 = 0;
2286 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2287 if (bss->tim[i]) {
2288 n1 = i & 0xfe;
2289 break;
2290 }
2291 }
2292 n2 = n1;
2293 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2294 if (bss->tim[i]) {
2295 n2 = i;
2296 break;
2297 }
2298 }
2299
2300 /* Bitmap control */
2301 *pos++ = n1 | aid0;
2302 /* Part Virt Bitmap */
5220da39 2303 skb_put(skb, n2 - n1);
e2ebc74d
JB		 2304 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2305
2306 tim[1] = n2 - n1 + 4;
e2ebc74d
JB		 2307 } else {
2308 *pos++ = aid0; /* Bitmap control */
2309 *pos++ = 0; /* Part Virt Bitmap */
2310 }
e2ebc74d
JB		 2311}
2312
eddcbb94
JB		 2313struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2314 struct ieee80211_vif *vif,
2315 u16 *tim_offset, u16 *tim_length)
e2ebc74d
JB		 2316{
2317 struct ieee80211_local *local = hw_to_local(hw);
9d139c81 2318 struct sk_buff *skb = NULL;
e039fa4a 2319 struct ieee80211_tx_info *info;
e2ebc74d
JB		 2320 struct ieee80211_sub_if_data *sdata = NULL;
2321 struct ieee80211_if_ap *ap = NULL;
5dfdaf58 2322 struct beacon_data *beacon;
55de908a 2323 enum ieee80211_band band;
e00cfce0 2324 struct ieee80211_tx_rate_control txrc;
55de908a 2325 struct ieee80211_chanctx_conf *chanctx_conf;
8318d78a 2326
5dfdaf58 2327 rcu_read_lock();
e2ebc74d 2328
32bfd35d 2329 sdata = vif_to_sdata(vif);
55de908a 2330 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
e2ebc74d 2331
55de908a 2332 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
eb3e554b
FF		 2333 goto out;
2334
eddcbb94
JB		 2335 if (tim_offset)
2336 *tim_offset = 0;
2337 if (tim_length)
2338 *tim_length = 0;
2339
05c914fe 2340 if (sdata->vif.type == NL80211_IFTYPE_AP) {
33b64eb2
LCC		 2341 ap = &sdata->u.ap;
2342 beacon = rcu_dereference(ap->beacon);
3ad97fbc 2343 if (beacon) {
902acc78
JB		 2344 /*
2345 * headroom, head length,
2346 * tail length and maximum TIM length
2347 */
2348 skb = dev_alloc_skb(local->tx_headroom +
2349 beacon->head_len +
2350 beacon->tail_len + 256);
2351 if (!skb)
2352 goto out;
33b64eb2 2353
902acc78
JB		 2354 skb_reserve(skb, local->tx_headroom);
2355 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2356 beacon->head_len);
33b64eb2 2357
d0709a65
JB		 2358 /*
2359 * Not very nice, but we want to allow the driver to call
2360 * ieee80211_beacon_get() as a response to the set_tim()
2361 * callback. That, however, is already invoked under the
2362 * sta_lock to guarantee consistent and race-free update
2363 * of the tim bitmap in mac80211 and the driver.
2364 */
2365 if (local->tim_in_locked_section) {
8860020e
JB		 2366 ieee80211_beacon_add_tim(sdata, ap, skb,
2367 beacon);
d0709a65
JB		 2368 } else {
2369 unsigned long flags;
2370
4d33960b 2371 spin_lock_irqsave(&local->tim_lock, flags);
8860020e
JB		 2372 ieee80211_beacon_add_tim(sdata, ap, skb,
2373 beacon);
4d33960b 2374 spin_unlock_irqrestore(&local->tim_lock, flags);
d0709a65 2375 }
33b64eb2 2376
eddcbb94
JB		 2377 if (tim_offset)
2378 *tim_offset = beacon->head_len;
2379 if (tim_length)
2380 *tim_length = skb->len - beacon->head_len;
2381
902acc78
JB		 2382 if (beacon->tail)
2383 memcpy(skb_put(skb, beacon->tail_len),
2384 beacon->tail, beacon->tail_len);
9d139c81
JB		 2385 } else
2386 goto out;
05c914fe 2387 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
46900298 2388 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
9d139c81 2389 struct ieee80211_hdr *hdr;
af8cdcd8 2390 struct sk_buff *presp = rcu_dereference(ifibss->presp);
33b64eb2 2391
af8cdcd8 2392 if (!presp)
9d139c81
JB		 2393 goto out;
2394
af8cdcd8 2395 skb = skb_copy(presp, GFP_ATOMIC);
9d139c81
JB		 2396 if (!skb)
2397 goto out;
2398
2399 hdr = (struct ieee80211_hdr *) skb->data;
e7827a70
HH		 2400 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2401 IEEE80211_STYPE_BEACON);
902acc78 2402 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
472dbc45 2403 struct ieee80211_mgmt *mgmt;
dbf498fb 2404 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
472dbc45 2405 u8 *pos;
3b69a9c5
TP		 2406 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2407 sizeof(mgmt->u.beacon);
472dbc45 2408
ac1bd846
JB		 2409#ifdef CONFIG_MAC80211_MESH
2410 if (!sdata->u.mesh.mesh_id_len)
2411 goto out;
2412#endif
2413
dbf498fb
JC		 2414 if (ifmsh->sync_ops)
2415 ifmsh->sync_ops->adjust_tbtt(
2416 sdata);
2417
3b69a9c5
TP		 2418 skb = dev_alloc_skb(local->tx_headroom +
2419 hdr_len +
2420 2 + /* NULL SSID */
2421 2 + 8 + /* supported rates */
2422 2 + 3 + /* DS params */
2423 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
176f3608 2424 2 + sizeof(struct ieee80211_ht_cap) +
074d46d1 2425 2 + sizeof(struct ieee80211_ht_operation) +
3b69a9c5
TP		 2426 2 + sdata->u.mesh.mesh_id_len +
2427 2 + sizeof(struct ieee80211_meshconf_ie) +
2428 sdata->u.mesh.ie_len);
902acc78
JB		 2429 if (!skb)
2430 goto out;
2431
2432 skb_reserve(skb, local->hw.extra_tx_headroom);
3b69a9c5
TP		 2433 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2434 memset(mgmt, 0, hdr_len);
065e9605
HH		 2435 mgmt->frame_control =
2436 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
e83e6541 2437 eth_broadcast_addr(mgmt->da);
47846c9b
JB		 2438 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2439 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
902acc78 2440 mgmt->u.beacon.beacon_int =
57c4d7b4 2441 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
082ebb0c
TP		 2442 mgmt->u.beacon.capab_info |= cpu_to_le16(
2443 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
902acc78
JB		 2444
2445 pos = skb_put(skb, 2);
2446 *pos++ = WLAN_EID_SSID;
2447 *pos++ = 0x0;
2448
55de908a
JB		 2449 band = chanctx_conf->channel->band;
2450
6b77863b 2451 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
082ebb0c 2452 mesh_add_ds_params_ie(skb, sdata) ||
6b77863b 2453 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
082ebb0c 2454 mesh_add_rsn_ie(skb, sdata) ||
176f3608 2455 mesh_add_ht_cap_ie(skb, sdata) ||
074d46d1 2456 mesh_add_ht_oper_ie(skb, sdata) ||
082ebb0c
TP		 2457 mesh_add_meshid_ie(skb, sdata) ||
2458 mesh_add_meshconf_ie(skb, sdata) ||
2459 mesh_add_vendor_ies(skb, sdata)) {
2460 pr_err("o11s: couldn't add ies!\n");
2461 goto out;
2462 }
9d139c81
JB		 2463 } else {
2464 WARN_ON(1);
5dfdaf58 2465 goto out;
e2ebc74d
JB		 2466 }
2467
55de908a
JB		 2468 band = chanctx_conf->channel->band;
2469
e039fa4a
JB		 2470 info = IEEE80211_SKB_CB(skb);
2471
3b8d81e0 2472 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
e00cfce0 2473 info->flags |= IEEE80211_TX_CTL_NO_ACK;
e039fa4a 2474 info->band = band;
e00cfce0
JM		 2475
2476 memset(&txrc, 0, sizeof(txrc));
2477 txrc.hw = hw;
e31583cd 2478 txrc.sband = local->hw.wiphy->bands[band];
e00cfce0
JM		 2479 txrc.bss_conf = &sdata->vif.bss_conf;
2480 txrc.skb = skb;
2481 txrc.reported_rate.idx = -1;
37eb0b16 2482 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
e31583cd 2483 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
37eb0b16
JM		 2484 txrc.max_rate_idx = -1;
2485 else
2486 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
19468413
SW		 2487 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2488 sizeof(txrc.rate_idx_mcs_mask));
8f0729b1 2489 txrc.bss = true;
e00cfce0 2490 rate_control_get_rate(sdata, NULL, &txrc);
e039fa4a
JB		 2491
2492 info->control.vif = vif;
f591fa5d 2493
a472e71b
JL		 2494 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2495 IEEE80211_TX_CTL_ASSIGN_SEQ |
2496 IEEE80211_TX_CTL_FIRST_FRAGMENT;
e6a9854b 2497 out:
5dfdaf58 2498 rcu_read_unlock();
e2ebc74d
JB		 2499 return skb;
2500}
eddcbb94 2501EXPORT_SYMBOL(ieee80211_beacon_get_tim);
e2ebc74d 2502
02945821
AN		 2503struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2504 struct ieee80211_vif *vif)
2505{
2506 struct ieee80211_if_ap *ap = NULL;
aa7a0080
ES		 2507 struct sk_buff *skb = NULL;
2508 struct probe_resp *presp = NULL;
02945821
AN		 2509 struct ieee80211_hdr *hdr;
2510 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2511
2512 if (sdata->vif.type != NL80211_IFTYPE_AP)
2513 return NULL;
2514
2515 rcu_read_lock();
2516
2517 ap = &sdata->u.ap;
2518 presp = rcu_dereference(ap->probe_resp);
2519 if (!presp)
2520 goto out;
2521
aa7a0080 2522 skb = dev_alloc_skb(presp->len);
02945821
AN		 2523 if (!skb)
2524 goto out;
2525
aa7a0080
ES		 2526 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2527
02945821
AN		 2528 hdr = (struct ieee80211_hdr *) skb->data;
2529 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2530
2531out:
2532 rcu_read_unlock();
2533 return skb;
2534}
2535EXPORT_SYMBOL(ieee80211_proberesp_get);
2536
7044cc56
KV		 2537struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2538 struct ieee80211_vif *vif)
2539{
2540 struct ieee80211_sub_if_data *sdata;
2541 struct ieee80211_if_managed *ifmgd;
2542 struct ieee80211_pspoll *pspoll;
2543 struct ieee80211_local *local;
2544 struct sk_buff *skb;
2545
2546 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2547 return NULL;
2548
2549 sdata = vif_to_sdata(vif);
2550 ifmgd = &sdata->u.mgd;
2551 local = sdata->local;
2552
2553 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
d15b8459 2554 if (!skb)
7044cc56 2555 return NULL;
d15b8459 2556
7044cc56
KV		 2557 skb_reserve(skb, local->hw.extra_tx_headroom);
2558
2559 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2560 memset(pspoll, 0, sizeof(*pspoll));
2561 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2562 IEEE80211_STYPE_PSPOLL);
2563 pspoll->aid = cpu_to_le16(ifmgd->aid);
2564
2565 /* aid in PS-Poll has its two MSBs each set to 1 */
2566 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2567
2568 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2569 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2570
2571 return skb;
2572}
2573EXPORT_SYMBOL(ieee80211_pspoll_get);
2574
2575struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2576 struct ieee80211_vif *vif)
2577{
2578 struct ieee80211_hdr_3addr *nullfunc;
2579 struct ieee80211_sub_if_data *sdata;
2580 struct ieee80211_if_managed *ifmgd;
2581 struct ieee80211_local *local;
2582 struct sk_buff *skb;
2583
2584 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2585 return NULL;
2586
2587 sdata = vif_to_sdata(vif);
2588 ifmgd = &sdata->u.mgd;
2589 local = sdata->local;
2590
2591 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
d15b8459 2592 if (!skb)
7044cc56 2593 return NULL;
d15b8459 2594
7044cc56
KV		 2595 skb_reserve(skb, local->hw.extra_tx_headroom);
2596
2597 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2598 sizeof(*nullfunc));
2599 memset(nullfunc, 0, sizeof(*nullfunc));
2600 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2601 IEEE80211_STYPE_NULLFUNC |
2602 IEEE80211_FCTL_TODS);
2603 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2604 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2605 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2606
2607 return skb;
2608}
2609EXPORT_SYMBOL(ieee80211_nullfunc_get);
2610
05e54ea6
KV		 2611struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2612 struct ieee80211_vif *vif,
2613 const u8 *ssid, size_t ssid_len,
2614 const u8 *ie, size_t ie_len)
2615{
2616 struct ieee80211_sub_if_data *sdata;
2617 struct ieee80211_local *local;
2618 struct ieee80211_hdr_3addr *hdr;
2619 struct sk_buff *skb;
2620 size_t ie_ssid_len;
2621 u8 *pos;
2622
2623 sdata = vif_to_sdata(vif);
2624 local = sdata->local;
2625 ie_ssid_len = 2 + ssid_len;
2626
2627 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2628 ie_ssid_len + ie_len);
d15b8459 2629 if (!skb)
05e54ea6 2630 return NULL;
05e54ea6
KV		 2631
2632 skb_reserve(skb, local->hw.extra_tx_headroom);
2633
2634 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2635 memset(hdr, 0, sizeof(*hdr));
2636 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2637 IEEE80211_STYPE_PROBE_REQ);
e83e6541 2638 eth_broadcast_addr(hdr->addr1);
05e54ea6 2639 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
e83e6541 2640 eth_broadcast_addr(hdr->addr3);
05e54ea6
KV		 2641
2642 pos = skb_put(skb, ie_ssid_len);
2643 *pos++ = WLAN_EID_SSID;
2644 *pos++ = ssid_len;
88c868c4 2645 if (ssid_len)
05e54ea6
KV		 2646 memcpy(pos, ssid, ssid_len);
2647 pos += ssid_len;
2648
2649 if (ie) {
2650 pos = skb_put(skb, ie_len);
2651 memcpy(pos, ie, ie_len);
2652 }
2653
2654 return skb;
2655}
2656EXPORT_SYMBOL(ieee80211_probereq_get);
2657
32bfd35d 2658void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2659 const void *frame, size_t frame_len,
e039fa4a 2660 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2661 struct ieee80211_rts *rts)
2662{
2663 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2664
065e9605
HH		 2665 rts->frame_control =
2666 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
32bfd35d
JB		 2667 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2668 frame_txctl);
e2ebc74d
JB		 2669 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2670 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2671}
2672EXPORT_SYMBOL(ieee80211_rts_get);
2673
32bfd35d 2674void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
e2ebc74d 2675 const void *frame, size_t frame_len,
e039fa4a 2676 const struct ieee80211_tx_info *frame_txctl,
e2ebc74d
JB		 2677 struct ieee80211_cts *cts)
2678{
2679 const struct ieee80211_hdr *hdr = frame;
e2ebc74d 2680
065e9605
HH		 2681 cts->frame_control =
2682 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
32bfd35d
JB		 2683 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2684 frame_len, frame_txctl);
e2ebc74d
JB		 2685 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2686}
2687EXPORT_SYMBOL(ieee80211_ctstoself_get);
2688
2689struct sk_buff *
32bfd35d 2690ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
e039fa4a 2691 struct ieee80211_vif *vif)
e2ebc74d
JB		 2692{
2693 struct ieee80211_local *local = hw_to_local(hw);
747cf5e9 2694 struct sk_buff *skb = NULL;
5cf121c3 2695 struct ieee80211_tx_data tx;
e2ebc74d
JB		 2696 struct ieee80211_sub_if_data *sdata;
2697 struct ieee80211_if_ap *bss = NULL;
5dfdaf58 2698 struct beacon_data *beacon;
e039fa4a 2699 struct ieee80211_tx_info *info;
55de908a 2700 struct ieee80211_chanctx_conf *chanctx_conf;
e2ebc74d 2701
32bfd35d 2702 sdata = vif_to_sdata(vif);
747cf5e9 2703 bss = &sdata->u.ap;
5dfdaf58 2704
5dfdaf58
JB		 2705 rcu_read_lock();
2706 beacon = rcu_dereference(bss->beacon);
55de908a 2707 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5dfdaf58 2708
55de908a
JB		 2709 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head ||
2710 !chanctx_conf)
747cf5e9 2711 goto out;
5dfdaf58 2712
512119b3 2713 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
747cf5e9 2714 goto out; /* send buffered bc/mc only after DTIM beacon */
e039fa4a 2715
e2ebc74d
JB		 2716 while (1) {
2717 skb = skb_dequeue(&bss->ps_bc_buf);
2718 if (!skb)
747cf5e9 2719 goto out;
e2ebc74d
JB		 2720 local->total_ps_buffered--;
2721
2722 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2723 struct ieee80211_hdr *hdr =
2724 (struct ieee80211_hdr *) skb->data;
2725 /* more buffered multicast/broadcast frames ==> set
2726 * MoreData flag in IEEE 802.11 header to inform PS
2727 * STAs */
2728 hdr->frame_control |=
2729 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2730 }
2731
3b8d81e0 2732 if (!ieee80211_tx_prepare(sdata, &tx, skb))
e2ebc74d
JB		 2733 break;
2734 dev_kfree_skb_any(skb);
2735 }
e039fa4a
JB		 2736
2737 info = IEEE80211_SKB_CB(skb);
2738
5cf121c3 2739 tx.flags |= IEEE80211_TX_PS_BUFFERED;
55de908a 2740 info->band = chanctx_conf->channel->band;
e2ebc74d 2741
97b045d6 2742 if (invoke_tx_handlers(&tx))
e2ebc74d 2743 skb = NULL;
97b045d6 2744 out:
d0709a65 2745 rcu_read_unlock();
e2ebc74d
JB		 2746
2747 return skb;
2748}
2749EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3b8d81e0 2750
55de908a
JB		 2751void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2752 struct sk_buff *skb, int tid,
2753 enum ieee80211_band band)
3b8d81e0 2754{
353d09c6 2755 int ac = ieee802_1d_to_ac[tid & 7];
3a25a8c8 2756
3b8d81e0
JB		 2757 skb_set_mac_header(skb, 0);
2758 skb_set_network_header(skb, 0);
2759 skb_set_transport_header(skb, 0);
2760
3a25a8c8 2761 skb_set_queue_mapping(skb, ac);
cf6bb79a 2762 skb->priority = tid;
cf0277e7 2763
3d34deb6
JB		 2764 /*
2765 * The other path calling ieee80211_xmit is from the tasklet,
2766 * and while we can handle concurrent transmissions locking
2767 * requirements are that we do not come into tx with bhs on.
2768 */
2769 local_bh_disable();
55de908a 2770 ieee80211_xmit(sdata, skb, band);
3d34deb6 2771 local_bh_enable();
3b8d81e0 2772}
Linux 6.x block layer and io_uring tree(s)